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Class 455/24 - Transmitter/receiver feedback compensation


Subclass of Class 455 - Telecommunications
Definition: Subject matter including apparatus to prevent unwanted feedback
No. of patents: 131
Last issue date: 04/02/2013


1        
NumberTitleIssue Date
8412095Apparatus for minimizing amplifier oscillation in an antenna system
Embodiments of an apparatus for minimizing oscillation of an amplifier in an antenna system are provided. These embodiments can comprise passive circuitry in the form of a coupling simulator that includes passive elements selected and combined to generate an output ...
04/02/2013
8385820Systems and method for canceling feedback interference
The present application discloses systems and methods for reducing output-to-input feedback signal interference caused by a forwarding node that is configured to forward information received from a transmitter. In some embodiments, this output-to-input feedback sign...
02/26/2013
8364076Apparatus and method of feedback cancellation for radio signal
A feedback signal cancellation apparatus includes a first RF receiver configured to down-convert a received RF signal to a predetermined frequency band, a subtractor configured to subtract a replica of a feedback signal from the down-converted signal, a transmission...
01/29/2013
8351851System and method for feedback cancellation in repeaters
An apparatus for repeating signals includes a receive antenna for receiving input signals, processing circuitry for processing the input signals to form repeated signals, and a transmit antenna for transmitting the repeated signals. The processing circuitry includes...
01/08/2013
8351850Apparatus for emitting and receiving radio-frequency signals, comprising a circuit to cancel interferences
An apparatus for emitting and receiving radio-frequency signals includes a circuit to cancel interference. The apparatus transmits and receives signals using an antenna, and isolates the transmission and receiving circuitry. The circuit taps a first part of a signal...
01/08/2013
8315559Transmitter and control method for transmitting and calibrating a phase signal and an amplitude signal
A transmitter for transmitting and calibrating a phase signal and an amplitude signal. The transmitter comprises a phase modulation path, an amplitude modulation path, and a control unit. The phase modulation path transmits the phase signal. The amplitude modulation...
11/20/2012
8238821Remote antenna system
Various methods, apparatuses, and systems are described in which a WAP is coupled to an antenna unit and provides a wireless LAN. In one embodiment, the antenna unit includes at least one remote antenna circuit having one or more ports to receive a control signal an...
08/07/2012
8238820On-channel repeater and on-channel repeating method
Provided is an on-channel repeater, which includes a receiver for receiving radio frequency (RF) signals; a subtractor for subtracting replica from the RF signals to thereby produce output signals of the subtractor; a repeating process unit for performing a repeatin...
08/07/2012
8180283Method of providing feedback to a media server in a wireless communication system
The present invention provides a method involving a media server, a wireless network, and at least one media client associated with at least one air interface with the wireless network. The method includes accessing first information indicative of at least one state...
05/15/2012
8135339System and method for feedback cancellation in repeaters
An apparatus for repeating signals includes a receive antenna for receiving input signals, processing circuitry for processing the input signals to form repeated signals, and a transmit antenna for transmitting the repeated signals. The processing circuitry includes...
03/13/2012
8126394Purposeful receive-path audio degradation for providing feedback about transmit-path signal quality
A technique applicable to a telecommunications system is disclosed that provides quality-related information in a receive path, in which the information serves as feedback about the call quality that is present in the corresponding transmit path. It is recognized th...
02/28/2012
8073387On frequency repeater with AGC stability determination
An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteris...
12/06/2011
8068783Adaptive echo cancellation for an on-frequency RF repeater using a weighted power spectrum
A wireless repeater includes an input antenna for receiving an input signal, an output antenna for outputting an amplified signal, and an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna. Radiated cou...
11/29/2011
7869761Radio repeater for mobile communication system and repeating method using the same
Disclosed herein is a radio frequency (RF) repeater comprising an analog signal processing unit and a digital signal processing unit, wherein the analog signal processing unit includes a filtering unit; an amplification unit on receiving side; a frequency conversion...
01/11/2011
7570916Method and apparatus for providing and obtaining broadcast multicast service feedback
Embodiments of the present invention provide a manner in which feedback from remote units (120-122) involved in a broadcast/multicast service session can be obtained using shared wireless resources and/or shared signaling sequences. Having feedback inf...
08/04/2009
7440530Circuit for and method of optimizing the transmission of data on a communication channel
A circuit for optimizing the transmission of data on a communication channel is disclosed. According to one embodiment of the invention, a circuit comprises a transmitter circuit having a programmable output characteristic and being coupled to a transmission media. ...
10/21/2008
7415253Temperature compensation of transmit power of a wireless communication device
A method for temperature compensation of transmit power of a wireless communication device begins by measuring transmit power of the wireless communication device at a first temperature-based biasing condition to produce a first measured transmit power. The method c...
08/19/2008
7411931Inter-frequency measurements with MIMO terminals
The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20′ in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16
08/12/2008
7409186Detection and elimination of oscillation within cellular network amplifiers
A system and method for substantially reducing oscillation produced by a network amplifier. An exemplary method includes receiving a cellular signal at a first antenna of a network amplifier and applying a first amplification factor to the cellular signal. The resul...
08/05/2008
7403853Position determination system for movable objects or personnel using GPS/TV location technology integrated with inertial navigation system
A position determination system for movable objects or personnel comprising at least one portable position sensor built into a wearable item of a member of personnel having an identification number, or embedded into a movable object having an identification number, ...
07/22/2008
7366244Method and system for antenna interference cancellation
A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of ...
04/29/2008
7363004Feedback information for controlling transmission in a communication system
A method is discussed for generating feedback information for controlling transmission from a transmitting end using a set of feedback symbols. The feedback information comprises a set of feedback words. At least one feedback symbol is determined based on at least o...
04/22/2008
7356749Method and apparatus for detecting a three-state signal in a base station in a wireless communications system
A decision as to whether a mobile terminal has transmitted an ACK, a NACK or a NULL from a received signal at a base station is made by successively eliminating one of the three possible transmitted symbols by sequentially applying decision rules that maximize netwo...
04/08/2008
7355993Method and apparatus for forward link gain control in a power controlled repeater
A power controlled repeater is disclosed for use in a wireless communication system to control the forward link gain. The power controlled repeater includes a forward link for communications from a base station to a mobile station. In addition, the power controlled ...
04/08/2008
7352824Multilevel pulse position modulation for efficient fiber optic communication
Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel ...
04/01/2008
7349505Relayed communication with versatile self-interference cancellation
Methods, apparatuses, and systems are presented for providing self-interference cancellation in two-way relayed electromagnetic communication between a first and a second device through a relay station, involving retrofitting existing equipment comprising a transmit...
03/25/2008
7346311Single frequency repeater
A novel single frequency repeater is disclosed that eliminates the problems of feedback and concurrent oscillation. The single frequency repeater of the present invention comprises a backplane, a first antenna, a filter, an amplifier, a power supply, a switch, and a...
03/18/2008
7340280Method of configuring base station, and base station
A base station and a method of configuring a base station are provided in a cellular telecommunication system, wherein the base station comprises an electrically tunable duplex filter with a tuning range covering at least two parallel sub-bands used in the telecommu...
03/04/2008
7336930Interference cancellation in wireless relaying networks
In accordance with the invention, signal information representative of a first set of information to be transmitted more than one time over at least one link is stored as a priori known signal information. This could be previously received and/or, detected informati...
02/26/2008
7329505Specific detection of proteolytic enzymes
Specific detection of proteolytic enzymes is achieved by extinguishing dye fluorescence by the amino acid tryptophan. Ttyptophan is disposed on one side of the cutting site of a proteolytic enzyme while an amino acid marked with a dye is arranged on the other side. ...
02/12/2008
7327802Method and apparatus for canceling the transmitted signal in a homodyne duplex transceiver
An apparatus comprises a transmitter, a receiver, an antenna and a signal cancellation circuit. The transmitter is configured to send a transmitter signal associated with a frequency. The receiver is associated with the frequency. The antenna is coupled to the trans...
02/05/2008
7319716Transmitter image suppression in TDD transceivers
In a transceiver comprising a time-division-duplex (TDD) of transmit and receive functions, the characteristics of unwanted image signal energy being transmitted from the transceiver are determined, and thereafter feedback is provided to the transmitter to reduce th...
01/15/2008
7310499Method, apparatus and system for handling unreliable feedback information in a wireless network
The present invention provides a method, apparatus and system for handling unreliable feedback information in a wireless network. The present invention adjusts one or more communications (202) with a receiving unit (272) in a wireless communication net...
12/18/2007
7301263Multiple electron beam system with electron transmission gates
A multiple electron beam source comprises a photon source to generate a photon beam, a lens to focus the photon beam, a photocathode having a photon receiving surface and an electron emitting surface, and an array of electron transmission gates spaced apart from the...
11/27/2007
7292547Device and method for nodal multiple access into communications channels
A nodal division multiple access technique for multiple access to a communications channel such as a satellite transponder. The present invention provides multiple access into a communications channel where each accessing site utilizes one signal from a composite am...
11/06/2007
7290196Cyclical redundancy check using nullifiers
An architecture and method for cyclical redundancy check (CRC) calculation and checking is disclosed. This architecture may include a CRC calculation function, a plurality of CRC nullification functions, and a multiplexer to select the output of one of the plurality...
10/30/2007
7283783Method and system for broadcasting via phase-shift keying modulation with multiple transmit antennas
A method of broadcasting multi-layered information in a multi-antenna broadcasting system can include identifying at least a first and second layer of information to be transmitted. The first layer of information can be encoded for transmission using a first unitary...
10/16/2007
7236740Data retransmission apparatus and method in a mobile communication system employing HARQ technique
A method and apparatus for retransmitting data in a mobile communication system wherein a receiver determines whether an initial data block received from a transmitter has an error. Upon detecting an error from the initial data block, the receiver estimates a curren...
06/26/2007
7218951Continuous closed-loop power control system including modulation injection in a wireless transceiver power amplifier
A single continuous closed-loop power control feedback system provides seamless power control for a power amplifier and also enables an AM signal to be injected into the power amplifier through the power amplifiers' control port. The AM signal is developed by an I/Q...
05/15/2007
7215721Method and system for decoding multilevel signals
A multilevel optical receiver can comprise a plurality of comparators that generally correspond with the number of levels in a multilevel data stream. Each comparator can be individually controlled and fed a decision threshold in order to decode a multilevel signal....
05/08/2007
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